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Parse/Sema: Add support for '#pragma options align=packed', which, it should be 

noted, is not the same as __attribute__((packed)). That would be ridiculous!

llvm-svn: 104865
This commit is contained in:
Daniel Dunbar 2010-05-27 18:42:17 +00:00
parent 663e8094ae
commit 9c84d4a8a0
4 changed files with 33 additions and 0 deletions
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1
clang/include/clang/Parse/Action.h
View File

@ -2567,6 +2567,7 @@ public:
enum PragmaOptionsAlignKind {
POAK_Native, // #pragma options align=native
POAK_Natural, // #pragma options align=natural
POAK_Packed, // #pragma options align=packed
POAK_Power, // #pragma options align=power
POAK_Mac68k, // #pragma options align=mac68k
POAK_Reset // #pragma options align=reset

2
clang/lib/Parse/ParsePragma.cpp
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@ -140,6 +140,8 @@ void PragmaOptionsHandler::HandlePragma(Preprocessor &PP, Token &OptionsTok) {
Kind = Action::POAK_Native;
else if (II->isStr("natural"))
Kind = Action::POAK_Natural;
else if (II->isStr("packed"))
Kind = Action::POAK_Packed;
else if (II->isStr("power"))
Kind = Action::POAK_Power;
else if (II->isStr("mac68k"))

7
clang/lib/Sema/SemaAttr.cpp
View File

@ -146,6 +146,13 @@ void Sema::ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
Context->setAlignment(0);
break;
// Note that '#pragma options align=packed' is not equivalent to attribute
// packed, it has a different precedence relative to attribute aligned.
case POAK_Packed:
Context->push(0);
Context->setAlignment(1);
break;
case POAK_Mac68k:
// Check if the target supports this.
if (!PP.getTargetInfo().hasAlignMac68kSupport()) {

23
clang/test/Sema/pragma-align-packed.c Normal file
View File

@ -0,0 +1,23 @@
// RUN: %clang-cc1 -triple i386-apple-darwin9 -fsyntax-only -verify %s
#pragma pack(push, 1)
struct s0 {
char f0;
int f1 __attribute__((aligned(4)));
};
extern int a[sizeof(struct s0) == 5 ? 1 : -1];
#pragma pack(pop)
struct __attribute__((packed)) s1 {
char f0;
int f1 __attribute__((aligned(4)));
};
extern int a[sizeof(struct s1) == 8 ? 1 : -1];
#pragma options align=packed
struct s2 {
char f0;
int f1 __attribute__((aligned(4)));
};
extern int a[sizeof(struct s2) == 5 ? 1 : -1];
#pragma options align=reset